What Am I to Do with my Son's Indented Facial Scar? (photo)

6 mo's ago my 6 yr old son scraped his face from mouth to outer cheekbone. Took him to ER, scape was shallow and split in two small areas along the length & Dr put dermabond on saying clean/neat. Initially troubled with surface scarring, but now that is a non issue, it's the rope of scar tissue beneath the skin pulling a long indentation the length of scar into his cheek. Beneath surface it feels like a cordy rope?! I was lucky to catch this shot, he turns to side in pics now, sad.